Remove IKeystoreMaintenance#getState()

IKeystoreMaintenance#getState() is no longer called, so remove it along
with the enum value for the GetState permission.

Bug: 296464083
Test: atest -p --include-subdirs system/security/keystore2
Change-Id: I9ec6cca78cd1eb899ac7adfc99fc5eee41dc7e44
5 files changed